EP 0521671 A2 19930107 - Low distortion all-optical threshold device.
Title (en)
Low distortion all-optical threshold device.
Title (de)
Verzerrungsarme optische Vorrichtung mit Schwelle.
Title (fr)
Dispositif à seuil tout optique à faible distorsion.
Publication
Application
Priority
US 72605791 A 19910705
Abstract (en)
Transmission capabilities of optical fibers are enhanced with all-optical means for removing noise from signal pulses and for creating clean output pulses with specified characteristics. This is accomplished with a nonlinear interferometer that is designed to operate on an amplified optical signal in the manner of a threshold device. More specifically, the nonlinear interferometer is designed to have a relatively level region in its input/output transfer function in the neighborhood of the low input signal and in the neighborhood of the high input signal. Depending on the input signal characteristics, it is sometimes beneficial to design the interferometer so that the nominal high level of the input signal falls approximately in the middle of its corresponding flat region. In another embodiment, a bandpass filter is included at the output of the interferometer to remove the excess bandwidth that is created by the preceding amplifiers and the interferometer itself. The filter also removes the out-of-band noise in the input signal.
IPC 1-7
IPC 8 full level
H04B 10/02 (2006.01); G02B 6/34 (2006.01); G02F 1/35 (2006.01); H04B 10/18 (2006.01)
CPC (source: EP US)
G02F 1/3519 (2013.01 - EP US); H04B 10/2507 (2013.01 - EP US); G02B 6/29347 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 5146517 A 19920908; DE 69225096 D1 19980520; DE 69225096 T2 19981112; EP 0521671 A2 19930107; EP 0521671 A3 19930901; EP 0521671 B1 19980415; JP 2509051 B2 19960619; JP H07303082 A 19951114
DOCDB simple family (application)
US 72605791 A 19910705; DE 69225096 T 19920626; EP 92305935 A 19920626; JP 19895492 A 19920703